Improvement in machines for sharpening horseshoe-calks



UNITED STATES PATENT OEEICE.

HAMILTON HOWELL, OF SALEM, OHIO.

IMPROVEMENT IN MACHINES FOR SHARPENING HORSESHOE-CALKS.

Specification forming part of Letters Patent No. 113,670, dated Aprill1, 1871.

To all whom it 'may concern:

Be it known that I, HAMILTON HOWELL, of Salem, in the county ofColumbiana and State of Ohio, have invented a new and useful Improvementin Machines for Sharpening Oalks while on the feet of the horse, ofwhich implement .the following is a specification, reference being hadto the accompanying drawing, in which- Figure l is a view inperspective, and Fig. 2 a sectional elevation, of the implement.

My invention relates to that class of instruments by which the side ofthe calk is cut away so as to give it a beveled edge.

Its object is to obtain an increased leverage as the cut progresses andthe resistance increases, and likewise to produce a simple and effectivemachine 5 to which ends the improvement consists in combining a fixedjaw to abut against one side ofthe calk, a movable cutter vibrating on apoint in said fixed jaw, and a lever vibrating on a pivot on the handleof the xed jaw and acting on the movable cutter, as hereinafter morefully set forth.

The handle A has a jaw, B, formed on one end, and is slotted verticallynear this jaw. A cutter, C, vibrates on a pivot in the slot of thehandle A. The rear end of the cutterstock is bent backward, and carriesafrictionroller, d. A lever, E, vibrates on a pivot, e, on the handle A.This lever also curves backward, and passes through a slot in the rearend of the cutter, between the friction-roller d on one side and a stop,d', on the other.

In operation the fixed jaw is placed against one side of the calk, thebottom of which rests against the ledge a.. The lever E is then swung upagainst the handle A, as shown in dotted lines in Fig. 2. As the leveris pressed up its curved part moves over the frictionroller and raisesthat end of the cutter-stock to which it is attached, thus depressingthe cutter into the slot of the handleAand shearing off the side of thecalk. As the lever E approaches the handle A the friction-rollerapproaches the pivot e of said lever, the length of which is thusincreased, and consequently greater power attained toward the end of thestroke. The lever, when depressed, bears against the stop d and retractsthe cutter for another stroke.

I thus secure a simple, compact, and effective implement, operating Withbut little friction, and with a positive movement both in opening andclosing the jaws.

I do not broadly claim, in a calli-cutter, the

combination of any two levers for operating the cutting-jaws, thatdevice being old.

I claim as my invention- The combination of the slotted xed jaw, theslotted vibrating cutter-stock, its frictionroller and stop, with thecurved vibrating lever pivoted to the handle and passing through theslot in the cutter-stock, all these members being constructed andoperating as hereinbefore set forth, so that the cutter works with anincrease of power from the beginning to the end of its stroke.

In testimony whereof I have hereunto subscribed my name.

HAMILTON HOWELL.

Witnesses:

GRANWLLE L. WATTsoN, R. H. GARRIGUEs.

